Tagging applies flexible labels to a contact, marking interests or behaviors that segments can later be built from.

Subscription management covers the full system of tracking and updating a subscriber's status across a list.

A subscriber is anyone who has given permission to receive email from a business.

A subject line is the first thing a subscriber sees, deciding whether an email gets opened at all.

A sticky banner stays visible on screen as a visitor scrolls, without covering the page content.

Split testing describes the same core practice as A/B testing, comparing two versions to see which performs better.